The upstream situation is about what it has been as far as I know. Maybe behind the scenes movement but still similar what’s outward facing - there’s archlinuxarm and the unofficial port Aarch64 | Arch Linux Ports . I run the unofficial port on a device and it works great for me but that’s in a limited role.
If Cachy want to focus on Cachy sauce on top of something that’s official Arch, the official Arch thing needs to exist.